import router from "@/router";
import axios from "axios";
import { ElMessage, ElMessageBox, ElNotification } from "element-plus";
import { getToken, removeToken } from "./auth";
import { tansParams } from "./campusTool";
import errorCode from "./errorCode";
import cache from "./plugins/chache";

axios.defaults.headers["Content-Type"] = "application/json;charset=utf-8";
// 创建axios实例
const service = axios.create({
  // axios中请求配置有baseURL选项，表示请求URL公共部分
  baseURL: import.meta.env.VITE_APP_BASE_API,
  // 超时
  timeout: 10000,
  headers: {
    "Access-Control-Allow-Origin": "*",
    "Access-Control-Allow-Headers": "X-Requested-With,Content-Type",
    "Access-Control-Allow-Methods": "PUT,POST,GET,DELETE,OPTIONS",
    "Content-Type": "application/json"
  }
});

// request拦截器
service.interceptors.request.use(config => {
  // 是否需要设置 token
  const isToken: boolean = (config.headers || {}).isToken === "true";
  // 是否需要防止数据重复提交
  const isRepeatSubmit: boolean = (config.headers || {}).repeatSubmit === false;
  if (isToken) {
    config.headers["Authorization"] = getToken(); // 让每个请求携带自定义token 请根据实际情况自行修改
  }
  // get请求映射params参数
  if (config.method === "get" && config.params) {
    let url: string = config.url + "?" + tansParams(config.params);
    url = url.slice(0, -1);
    config.params = {};
    config.url = url;
  }
  if (!isRepeatSubmit && (config.method === "post" || config.method === "put")) {
    const requestObj = {
      url: config.url,
      data: typeof config.data === "object" ? JSON.stringify(config.data) : config.data,
      time: new Date().getTime()
    };
    const sessionObj = cache.session.getJSON("sessionObj");
    if (sessionObj === undefined || sessionObj === null || sessionObj === "") {
      cache.session.setJSON("sessionObj", requestObj);
    } else {
      const s_url = sessionObj.url;                // 请求地址
      const s_data = sessionObj.data;              // 请求数据
      const s_time = sessionObj.time;              // 请求时间
      const interval = 2000;                       // 间隔时间(ms)，小于此时间视为重复提交
      if (s_data === requestObj.data && requestObj.time - s_time < interval && s_url === requestObj.url) {
        const message = "数据正在处理，请勿重复提交";
        console.warn(`[${s_url}]: ` + message);
        return Promise.reject(new Error(message));
      } else {
        cache.session.setJSON("sessionObj", requestObj);
      }
    }
  }
  return config;
}, error => {
  Promise.reject(error);
});

// 响应拦截器
service.interceptors.response.use(res => {
    // 未设置状态码则默认成功状态
    const code = res.data.code || 200;
    // 获取错误信息
    const msg = res.data.message || errorCode["default"];
    // 二进制数据则直接返回
    if (res.request.responseType === "blob" || res.request.responseType === "arraybuffer") {
      return res.data;
    }
    if (code === 401) {
      ElMessageBox.confirm("登录状态已过期，您可以继续留在该页面，或者重新登录", "系统提示", {
        confirmButtonText: "重新登录",
        cancelButtonText: "取消",
        confirmButtonClass: "button",
        type: "warning"
      }).then(() => {
        router.push({ path: "/login" });
        removeToken();
      });
      return Promise.reject("无效的会话，或者会话已过期，请重新登录。");
    } else if (code === 500) {
      ElMessage({ message: msg, type: "error" });
      return Promise.reject(new Error(msg));
    } else if (code === 601) {
      ElMessage({ message: msg, type: "warning" });
      return Promise.reject(new Error(msg));
    } else if (code !== 200) {
      ElNotification.error({ title: msg });
      return Promise.reject("error");
    } else {
      return Promise.resolve(res.data);
    }
  },
  error => {
    console.log("err" + error);
    let { message } = error;
    if (message == "Network Error") {
      message = "后端接口连接异常";
    } else if (message.includes("timeout")) {
      message = "系统接口请求超时";
    } else if (message.includes("Request failed with status code")) {
      message = "系统接口" + message.substr(message.length - 3) + "异常";
    }
    ElMessage({ message: message, type: "error", duration: 5 * 1000 });
    return Promise.reject(error);
  }
);

// // 通用下载方法
// export function download(url, params, filename, config) {
//   downloadLoadingInstance = ElLoading.service({ text: "正在下载数据，请稍候", background: "rgba(0, 0, 0, 0.7)", })
//   return service.post(url, params, {
//     transformRequest: [(params) => { return tansParams(params) }],
//     headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
//     responseType: 'blob',
//     ...config
//   }).then(async (data) => {
//     const isLogin = await blobValidate(data);
//     if (isLogin) {
//       const blob = new Blob([data])
//       saveAs(blob, filename)
//     } else {
//       const resText = await data.text();
//       const rspObj = JSON.parse(resText);
//       const errMsg = errorCode[rspObj.code] || rspObj.msg || errorCode['default']
//       ElMessage.error(errMsg);
//     }
//     downloadLoadingInstance.close();
//   }).catch((r) => {
//     console.error(r)
//     ElMessage.error('下载文件出现错误，请联系管理员！')
//     downloadLoadingInstance.close();
//   })
// }

export default service;
